Research and Application of Trigonometric Leveling to Replace Precise Leveling
Publication: Journal of Surveying Engineering
Volume 147, Issue 3
Abstract
Aiming at the low efficiency of precise geodetic leveling in tough terrain, we propose a precise trigonometric leveling (PTL) method to replace first-order Class II leveling. First, we analyze the errors of unidirectional trigonometric leveling and list corresponding ways to reduce those errors. Then, the practical formula of PTL is introduced that combines the simultaneous reciprocal observation with the leap-frog method to reduce the effect of atmospheric refraction. Besides, the PTL method uses two robotic total stations to perform an even number of reciprocal observations to avoid measuring the heights of instruments. Finally, two experiments are conducted using the PTL method; one is river-crossing precise leveling, and the other is highland precise leveling. Compared with the precise geometric leveling in the 25 km of the leveling circuit, the result shows that the standard deviation per kilometer of PTL is , which is less than and proves that PTL can achieve first-order Class II leveling precision to some degree conditions.
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Data Availability Statement
All raw data that support the findings of this study are available from the corresponding author upon reasonable request, and the trial software of data collection can be available from the corresponding author.
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© 2021 American Society of Civil Engineers.
History
Received: Jun 19, 2020
Accepted: Apr 16, 2021
Published online: Jun 8, 2021
Published in print: Aug 1, 2021
Discussion open until: Nov 8, 2021
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